Questions tagged [experimental-technique]

filling in the unspecified details of elegant-sounding descriptions of experimental methods.

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1answer
67 views

Taring a digital scale improves precision?

Suppose you need to weight something that weights $x$ in a digital scale that reads a non zero value a when empty. There are two options: Tare the scale and weight, giving $x \pm \Delta x_1$. Weight ...
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1answer
43 views

Collimation issue with an DIY spectrograph

I am trying to make an educational echelle spectrograph using easily available materials, basically in a cardboard box. An echelle grating (36 lines/mm) needs another prism to do a cross dispersion ...
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62 views

Could a device witnessing the Free Will Theorem be handheld?

After watching Conway's lectures on free will, I realized that I wanted a device akin to a Magic 8-Ball®, but rather than being influenced by the cosmos, it would be free of surrounding influences. Is ...
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4answers
52 views

Experiment to show that current leads voltage by 90° in capacitor

I understand that current leads voltage by 90° in capacitor. How does one show that it is true by an experiment?
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1answer
23 views

What metrics can be used to quantify underestimation of uncertainties?

Suppose an experiment measures a quantity to be $5 \pm 0.3$ and another measures it to be $9 \pm 0.3$ What metrics can be used to emphasize and quantify the error in the estimation of uncertainties by ...
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28 views

AdS/CFT-oriented reviews of experimental techniques?

I am doing a PhD in AdS/CMT. In order to have a better understating of the physics of the systems the correspondence aims to describe, I am looking for accessible reviews or online seminars about the ...
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5 views

How to tell which side of a transparent substrate has epitaxial growth?

If someone drops an unmarked sample with a thin film on a transparent epitaxial substrate, what is the easiest way to tell which side has the thin film on it? The substrate itself is also pretty thin. ...
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59 views

Wave function collapse for experimental quantum state preparation

Has the John von Neumann projection, or the wave function collapse, been used in the experimental preparation of quantum states? As an illustration, for a pair of EPR-type entangled 2-level atoms $$|\...
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54 views

Experimental examples of how to realize the photon coherent state

As well known in the theory of quantum optics, the photon coherent state is defined by $$\hat{a}|\alpha\rangle = \alpha|\alpha\rangle$$ where $\hat{a}$ is the annihilation operator. Explicitly this ...
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1answer
71 views

Distinguish between measuring devices and 'sources of unitary evolution'?

In a quantum optics lab, imagine that we are given with a collection of experimental tools to set-up an experiment on an optical table. This collection could consist of devices like photon detectors, ...
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2answers
142 views

Why do scientists need to measure extremely small intervals of time?

Why do scientists need to measure extremely small intervals of time? Why is it necessary?
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2answers
207 views

How is speed measured in the LHC

In this question: "Without the Michelson-Morley experiment, is there any other reason to think speed of light is the universal speed limit?", it is stated in Emilio Pisanty's answer that From a ...
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1answer
33 views

Electromagnetic Induction experiment with solenoid

The experiment is as follows A solenoid is connected to a galvanometer and a magnetised iron rod is passed through it. (the apparatus is not ideal, and there is no zero error in the galvanometer) I ...
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1answer
60 views

How do you measure the parity of a particle?

When one looks up elementary particles on Wikipedia, as one of their properties their parity is stated. For example the Proton has parity $+1$, while a Pion has parity $-1$. I understand that you have ...
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Air track acceleration experiment

What can be a major error when we are calculating the acceleration of a matter, using the air track? As shown in the picture, the goal is to measure the acceleration of the matter(M). I will hang the ...
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2answers
91 views

How do we observe that $\frac{dN}{dt} \propto N$?

I was learning how do derive the radioactive decay formula which starts with the experimental observation that the rate of decay is directly proportional to the amount of isotope present. i.e. $\frac{...
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1answer
48 views

Accurate method or instrument to measure density of shaving cream foam or whipped cream foam?

I am currently filling a "standard" stainless steel cup of known volume with foam and then I weigh it. Then I calculate density. This method is pretty messy and I have to be careful about how I fill ...
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1answer
45 views

Can a slab with a set of IR torches on it help to prevent blossom freeze in early spring?

Every year there are lot's of problems with blossom freeze caused by sudden drop in temperature of the envirement and cold winds. Can a set of parallel infrared torches have a low drop of intensity ...
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1answer
30 views

Electron irradiation of an entire isotope mass [closed]

I'm going to post this question in a "goal" and "question" format so it is easier to follow along: The Goal I'm planning on running a nuclear physics experiment in which I have an arbitrary mass of ...
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1answer
50 views

Extracting yields of decays from fits

I'm currently reading various papers on the violation of Lepton Flavour Universality in rare B-decays and I would appreciate some help in understanding the methodology for measuring the ratios in ...
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0answers
54 views

Normalized superpositions of two, given at will, coherent states

In many papers it is nicely demonstrated how to prepare in laboratory an arbitrary pure superposition of the two CSS states $(|z\rangle + |-z\rangle)$ and $(|z\rangle- |-z\rangle)$ ($z$ arbitrary ...
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24 views

Beryllium Neutron Multiplier

We know that Beryllium is used in blankets of Fusion Systems because it is a neutron multiplier. I was wondering that if Beryllium is a neutron multiplier can it be used in the fission process(of ...
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0answers
53 views

Uncertainty in laser beam width

I have voltage vs position data for the cross-sectional profile of a laser beam, acquired from a photodiode, and I'm trying to find the beam's width and the uncertainty in the width. I was planning to ...
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1answer
70 views

Plausibility of detecting viruses using optical spectra [closed]

Ok, this is a huge long shot, and I also apologise if this is a poor question (I'm a newbie here...). This doesn't seem to me a strictly perfect fit for Chemistry.SE, Biology.SE, or Photography.SE ...
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1answer
22 views

How to make laser written waveguides?

I don't know if this is the right place to make such a question, but I have spent a few days trying to get a review or really informative article on how to make Photonic Integrated Circuits by laser ...
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1answer
22 views

Why do (semi-)conducting materials absorb microwaves at their cyclotron frequency? - Cyclotron Resonance Technique

I am currently studying third year physics - more specifically a solid state course. It was mentioned that in order to determine the effective mass of an electron in the nearly-free-electron model ...
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1answer
80 views

Does more and more measurements of $X$ indefinitely improve $\sigma_X^2$?

For a physical quantity $X$, does the standard deviation $\sigma^2_X\equiv\langle X^2\rangle-\langle X\rangle^2$ calculated from $N$ measurements smaller than that calculated from $N^\prime(<N)$ ...
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24 views

How to calculate acceleration using ADXL345? [duplicate]

I am trying to measure the acceleration and deceleration of a bike by using an 3 axis accelerometer (ADXL345). I know the formula of calculating acceleration using the $x,y,z$-components with respect ...
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2answers
80 views

How to heat a gas to ~3000K? [closed]

I'm not much of an experimentalist, but I was wondering if there are any well-known, and relatively straightforward ways of heating gasses to high temperatures (~3000K). Say, I have a sealed ceramic ...
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16 views

membrane for a reverse osmosis desalination experiment

We are second year cram schoolers , we are currently working on a project tackling water desalination by reverse osmosis and are required to do an experience. During the process, we encountered some ...
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2answers
29 views

Deposition of Aluminium Nitride is giving me a range of colors. Why?

I have been trying to deposit Aluminium Nitride via RF Sputtering at certain conditions and the resultant thing I have is a range of colors from blue to brown at the substrate holder. Can anyone ...
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8answers
6k views

Given fluids expand non-linearly, how were physicists able to make a linear temperature scale?

Materials expand with increase in temperature. As far as I know this property for fluids was put in use to make initial thermometers. We know that expansion of fluid is given by the following formula (...
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2answers
67 views

Can I have one single molecule of water?

Is it possible detach one single molecule of water into vacuum lab?
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1answer
110 views

What is the apparatus used in the 1998 Weizmann experiment ..?

Basically what the title says... For mode context, refer article in the link... https://www.sciencedaily.com/releases/1998/02/980227055013.htm I understand that trying [trying: using variable current ...
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2answers
52 views

What is baking and what are the effects?

In their experiment, Davisson and Germer had to bake the nickel mass because it was oxidized. What is baking and what does it do to the lattice of the metal?
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1answer
121 views
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Is there an affordable way to create entagled lightbeams?

I have heard it is possible to create entangled laser beams using a process roughly similar to this: Pass the beam through a crystal that splits each photon into two, each of half the energy of the ...
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1answer
41 views

Distance between laser diode and photodetector

I have a laser diode with a wide divergent elliptical beam (angles: 57°-13°). If I want to use a light detector with 50mm diameter, how can I estimate the distance at which I can put the LD from the ...
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17 views

Experimental resolution when measuring an oscillatory physical quantity

Say, I want to sample a time-dependent quantity $c(t)$, the experimental resolution of this quantity is limited, denoted as $\delta c$; which means, to my knowledge, that if one wants to distinguish ...
4
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1answer
49 views

How to subtract background from many spectra which were taken with different background intensity?

I have two spectra, a spectrum of background signal (let's call it Reference) and measured spectrum consisting of searched signal and background signal. The searched signal is a peak/s with various ...
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50 views

How can I create gamma rays with energy >2MeV?

I have been exploring pair production (electron/positron) using gamma, and with a Cobalt-60 source this is easy enough. That's just the problem, though. I'm looking for a challenge. I want a stream ...
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2answers
84 views

How could the momentum of a particle be directly measured in experiment?

What could be done in actual experiment to directly measure the momentum of a particle (i.e. without measuring position) in such a way that would collapse the wave function (i.e. reduce the amount of ...
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0answers
47 views

Linear dependence on photoelectric current

I have done a lab experiment in which we had to determine the Planck's constant through photoelectric effect. The equation reigning this experiment is: $$eV_c=h\nu-W$$ Where $\nu$ is the radiation ...
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0answers
45 views

For experiments, how to ensure two photons arrive at beam splitter at the same time?

I'm working on work related DLCZ protocol. In DLCZ protocol, a beam splitter will be settled in the central of two ensembles (you can think it as light source). Ensembles will emit photons ...
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0answers
203 views

How is a spectrometer is calibrated for intensity?

For the case of spectrophotometers, we can easily calibrate the device(intensity wise) taking the light source inside the device as the reference, without any need of precise knowledge about its ...
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2answers
60 views

Linear Regressions vs Algebra & Averaging in Solving for a Constant

I'm current taking AP Physics, and in both of the labs performed so far (Snell's Law/Refraction and Galileo's Inclined Plane), I have been trying to calculate some constant from a linear relationship ...
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1answer
22 views

Would SiPMs respond differently to scintillation light from neutrons vs. gammas?

I have a fast-neutron scintillator which also is sensitive to gammas (much less so, though). When I connect it to a SiPM instead of a PMT, the gamma pulses (obtained from performing pulse shape ...
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1answer
31 views

Why photodiode measures random phase superpositions on continuous-wave (10kHz) white light?

I measured a 10 kHz modulated white light using a photodiode (Thorlabs PDA10A): Unexpectedly, the photodiode output sensitively depends on the orientation and position of the photodiode. For two ...
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3answers
155 views

Does frequency of light change in the LIGO interferometer arms?

There are a number of questions on the internet and on this site asking about how the LIGO interferometer measurement works given that the gravitation wave stretches both the length of the ...
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100 views

Initial conditions in QM

My questions are about initial conditions in QM in experiment and in lab. We consider many different initial wave functions, and we solve the problem on paper. Now, I have 2 questions about this in ...
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1answer
37 views

Do we need to know Earth's magnetic field locally?

I'm a high school student and in our course we have elements of earth's magnetic field (dip and other stuff) that lets us know the value and direction of magnetic field at any point on the planet. I ...

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